August 14, 2020


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Pi day


Pi Day

In another sign that Google employees have too much time on their hands: A Google employee, Emma Haruka Iwao, just spent four months working on a childhood dream project in which she calculated pi to 31.4 trillion digits.

Today is Pi day, which is an annual celebration of the mathematical constant π  which represents the ratio of the circumference of a circle to its diameter — which is approximately 3.14159 - duh.

Iwao performed her calculations from Google's office in Osaka, Japan, where she works at as a developer for Google Cloud. 

Her milestone was certified by Guinness World Records on Wednesday, making her the third woman to set a world record for calculating the number. Iwao broke the record for pi set by Peter Trueb in 2016, which was 22.4 trillion digits long.

"It was my childhood dream, a longtime dream, to break the world record for pi," Iwao told CNN Business. She has been working toward this moment since she was 12, when she first downloaded software to calculate pi on her personal computer.

It's also a day for great deals on $3.14 pizza, or 'Pie' as people in Chicago like to call it.

Pi Day is observed on March 14 since 3, 1, and 4 are the first three significant digits of π. In 2009, the United States House of Representatives, having nothing better to do,  supported the designation of Pi Day.

The earliest known official or large-scale celebration of Pi Day was organized by a physicist named Larry Shaw in 1988 at the San Francisco Exploratorium.

Pi has been calculated to over one trillion digits beyond its decimal point. As an irrational and transcendental number, it will continue infinitely without repetition or pattern. While only a handful of digits are needed for typical calculations, Pi’s infinite nature makes it a fun challenge to memorize and to computationally calculate more and more digits.

As a refresher:

The area of a circle.

A = πr2

Where ‘r’ is the radius (distance from the center to the edge of the circle). Also, this formula is the origin of the joke “Pies aren’t square, they’re round!”

The volume of a cylinder.

V = πr2h

To find the volume of a rectangular prism, you calculate length × width × height. In that case, length × width is the area of one side (the base), which is then multiplied by the height of the prism. Similarly, to find the volume of a cylinder, you calculate the area of the base (the area of the circle), then multiply that by the height (h) of the cylinder.

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Ran DeBord ~  All Access Sporting News

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